Preparation method and product of bismuth oxycarbonate microspheres

A technology of bismuth oxycarbonate and microspheres, applied in chemical instruments and methods, bismuth compounds, inorganic chemistry, etc., can solve the problems of rarity, decreased dispersion performance, agglomeration of bismuth oxycarbonate nanoparticles, etc., and achieves a simple preparation process and low cost. , the effect of easy large-scale production

Inactive Publication Date: 2014-12-24
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In order to make better use of the photocatalytic degradation performance of bismuth oxycarbonate, researchers have developed bismuth oxycarbonate photocatalytic materials with various shapes. The existing bismuth oxycarbonate materials are mostly cubic, polyhedral, nano-strip or Irregular shape, reports on bismuth oxytitanate

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  • Preparation method and product of bismuth oxycarbonate microspheres
  • Preparation method and product of bismuth oxycarbonate microspheres

Examples

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Example Embodiment

[0025] Example 1

[0026] 1) Weigh 5.1 mmol of tetrabutyl titanate and add it dropwise to deionized water to control the concentration of tetrabutyl titanate to 0.4 mol / L.

[0027] 2) Weigh 6.8mmol of bismuth nitrate pentahydrate, add it to the suspension prepared in step 1), and stir well

[0028] 3) Weigh 0.02 mol potassium hydroxide, dissolve it in ionized water, control the concentration of potassium hydroxide to 2.0 mol / L, and stir for at least 30 minutes.

[0029] 4) Under agitation, the potassium hydroxide solution prepared in step 3) is added dropwise to the suspension prepared in step 2) at a rate of 30 drops per minute, and is dispersed after sufficient stirring and ultrasonic vibration.

[0030] 5) Add the suspension prepared in step 4) to the inner bladder of the reactor. Use deionized water to adjust its volume to account for 4 / 5 of the inner tank volume of the reactor to obtain a reaction precursor suspension. At this time, the molar ratio of Bi / Ti in the reaction precur...

Example Embodiment

[0032] Example 2

[0033] 1) Weigh 5.1 mmol of tetrabutyl titanate and add it dropwise to deionized water to control the concentration of tetrabutyl titanate to 0.5 mol / L.

[0034] 2) Weigh 6.8mmol of bismuth nitrate pentahydrate, add it to the suspension prepared in step 1), and stir well

[0035] 3) Weigh 0.02 mol potassium hydroxide, dissolve it in ionized water, adjust the concentration of potassium hydroxide to 1.8 mol / L, and stir for at least 30 minutes.

[0036] 4) Under stirring, the potassium hydroxide solution prepared in step 3) is added dropwise to the suspension prepared in step 2) at a rate of 40 drops per minute, and the solution is dispersed after sufficient stirring and ultrasonic vibration.

[0037] 5) Add the suspension prepared in step 4) to the inner bladder of the reactor. Use deionized water to adjust its volume to account for 4 / 5 of the inner tank volume of the reactor to obtain a reaction precursor suspension. At this time, the molar ratio of Bi / Ti in the reac...

Example Embodiment

[0039] Example 3

[0040] 1) Weigh 5.1 mmol of tetrabutyl titanate and add it dropwise to deionized water to control the concentration of tetrabutyl titanate to 0.6 mol / L.

[0041] 2) Weigh 6.8mmol of bismuth nitrate pentahydrate, add it to the suspension prepared in step 1), and stir well

[0042] 3) Weigh 0.02 mol potassium hydroxide, dissolve it in ionized water, control the concentration of potassium hydroxide to 2.0 mol / L, and stir for at least 30 minutes.

[0043] 4) Under agitation, the potassium hydroxide solution prepared in step 3) is added dropwise to the suspension prepared in step 2) at a rate of 30 drops per minute, and is dispersed after sufficient stirring and ultrasonic vibration.

[0044] 5) Add the suspension prepared in step 4) to the inner bladder of the reactor. Use deionized water to adjust its volume to account for 4 / 5 of the inner tank volume of the reactor to obtain a reaction precursor suspension. At this time, the molar ratio of Bi / Ti in the reaction precur...

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Abstract

The invention discloses a preparation method of bismuth oxycarbonate microspheres. The preparation method comprises the following steps: mixing tetrabutyl titanate and bismuth nitrate pentahydrate with water to obtain suspension liquid, wherein the molar ratio of bismuth nitrate pentahydrate to tetrabutyl titanate is (11-13) to (8-10); dropwise adding a KOH solution into the suspension liquid to obtain a precursor solution, wherein in the precursor solution, the KOH concentration is 0.4-0.6 mol/L and the bismuth nitrate pentahydrate concentration is 0.1-0.2 mol/L; conducting hydrothermal reaction of the precursor solution at 210-230 DEG C for 23-25 hours, and performing post-treatment to obtain the bismuth oxycarbonate microspheres. The prepared bismuth oxycarbonate microspheres have rough surfaces and the average diameter of 1-3 microns; bismuth oxycarbonate has a remarkable degradation effect on toxic organic pollutants and has a wide application prospect on the aspect of environmental control.

Description

technical field [0001] The invention relates to a preparation method of inorganic non-metallic materials, in particular to a preparation method and product of bismuth oxycarbonate microspheres. Background technique [0002] In recent years, the heterogeneous photocatalytic technology using semiconductor oxides as catalysts has become an ideal environmental pollution control technology, and the application of photohydrolysis hydrogen production has been extensively studied. Among them, titanium dioxide is considered to be the most promising semiconductor photocatalyst due to its chemical and biological inertness, high stability, non-toxicity and low cost. However, two inherent defects of titanium dioxide limit its practical application: (1) TiO 2 The band gap is wide, and it can only be excited by ultraviolet light with a wavelength less than 386.5nm; (2) TiO 2 The electrons and holes generated by photoexcitation are easy to recombine, resulting in extremely low photon quan...

Claims

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Application Information

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IPC IPC(8): C01G29/00
Inventor 徐刚白惠文邓世琪沈鸽韩高荣
Owner ZHEJIANG UNIV
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